package com.atguigu.gulimall.cart.interceptor;

import com.atguigu.common.constant.AuthServerConstant;
import com.atguigu.common.constant.CartConstant;
import com.atguigu.common.vo.MemberRespVo;
import com.atguigu.gulimall.cart.to.UserInfoTo;
import org.apache.catalina.User;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.Arrays;
import java.util.Objects;
import java.util.UUID;

/**
 * @DESCRIPTION: 在执行目标方法之前 判断用户的登录状态 并封装传递给controller目标请求
 * @author: zr
 * @DATE: 2023/1/30 23:18
 */

public class CartInterceptor implements HandlerInterceptor {
    public static ThreadLocal<UserInfoTo> threadLocal = new ThreadLocal<>();

    /**
     * 目标方法之前执行
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        HttpSession session = request.getSession();
        UserInfoTo userInfoTo = new UserInfoTo();
        MemberRespVo loginUser = (MemberRespVo) session.getAttribute(AuthServerConstant.LOGIN_USER);
        if (Objects.nonNull(loginUser)) {
            // 用户已经登录
            userInfoTo.setUserId(loginUser.getId());
        }
        Cookie[] cookies = request.getCookies();
        // 会导致空指针 arrays.asList cookies 为null
//        if (!CollectionUtils.isEmpty(Arrays.asList(cookies))) {
        if (cookies != null && cookies.length > 0) {
            for (Cookie cookie : cookies) {
                // 设置userKey
                String cookieName = cookie.getName();
                if (CartConstant.TEMP_USER_COOKIE_NAME.equals(cookieName)) {
                    userInfoTo.setUserKey(cookie.getValue());
                    userInfoTo.setTempUser(true);
                }
            }
        }
        // 如果没有临时用户一定要分配一个临时用户
        if (StringUtils.hasText(userInfoTo.getUserKey())){
            String uuid = UUID.randomUUID().toString();
            userInfoTo.setUserKey(uuid);
        }
        // 放行之前  将用户信息 设置到ThreadLocal中共享数据
        threadLocal.set(userInfoTo);
        return true;
    }

    /**
     * 业务执行之后 分配临时用户 让浏览器保存
     *
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        UserInfoTo userInfoTo = threadLocal.get();
        if (!StringUtils.isEmpty(userInfoTo.isTempUser())) {
            // 是临时用户 新增cookie
            Cookie cookie = new Cookie(CartConstant.TEMP_USER_COOKIE_NAME, userInfoTo.getUserKey());
            cookie.setDomain("gulimall.com");
            // 添加过期时间
            cookie.setMaxAge(CartConstant.TEMP_USER_COOKIE_TIMEOUT);
            response.addCookie(cookie);

        }
    }
}
